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#ifndef _IPXE_NTP_H
#define _IPXE_NTP_H
/** @file
*
* Network Time Protocol
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
#include <ipxe/in.h>
#include <ipxe/interface.h>
/** NTP port */
#define NTP_PORT 123
/** An NTP short-format timestamp */
struct ntp_short {
/** Seconds */
uint16_t seconds;
/** Fraction of a second */
uint16_t fraction;
} __attribute__ (( packed ));
/** An NTP timestamp */
struct ntp_timestamp {
/** Seconds */
uint32_t seconds;
/** Fraction of a second */
uint32_t fraction;
} __attribute__ (( packed ));
/** An NTP reference identifier */
union ntp_id {
/** Textual identifier */
char text[4];
/** IPv4 address */
struct in_addr in;
/** Opaque integer */
uint32_t opaque;
};
/** An NTP header */
struct ntp_header {
/** Flags */
uint8_t flags;
/** Stratum */
uint8_t stratum;
/** Polling rate */
int8_t poll;
/** Precision */
int8_t precision;
/** Root delay */
struct ntp_short delay;
/** Root dispersion */
struct ntp_short dispersion;
/** Reference clock identifier */
union ntp_id id;
/** Reference timestamp */
struct ntp_timestamp reference;
/** Originate timestamp */
struct ntp_timestamp originate;
/** Receive timestamp */
struct ntp_timestamp receive;
/** Transmit timestamp */
struct ntp_timestamp transmit;
} __attribute__ (( packed ));
/** Leap second indicator: unknown */
#define NTP_FL_LI_UNKNOWN 0xc0
/** NTP version: 1 */
#define NTP_FL_VN_1 0x20
/** NTP mode: client */
#define NTP_FL_MODE_CLIENT 0x03
/** NTP mode: server */
#define NTP_FL_MODE_SERVER 0x04
/** NTP mode mask */
#define NTP_FL_MODE_MASK 0x07
/** NTP timestamp for start of Unix epoch */
#define NTP_EPOCH 2208988800UL
/** NTP fraction of a second magic value
*
* This is a policy decision.
*/
#define NTP_FRACTION_MAGIC 0x69505845UL
/** NTP minimum retransmission timeout
*
* This is a policy decision.
*/
#define NTP_MIN_TIMEOUT ( 1 * TICKS_PER_SEC )
/** NTP maximum retransmission timeout
*
* This is a policy decision.
*/
#define NTP_MAX_TIMEOUT ( 10 * TICKS_PER_SEC )
extern int start_ntp ( struct interface *job, const char *hostname );
#endif /* _IPXE_NTP_H */
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